Move WriteFile and WriteFileDescriptor from file_util to base namespace.

chrome/browser/value_store/leveldb_value_store_unittest.cc

Index: chrome/browser/value_store/leveldb_value_store_unittest.cc
diff --git a/chrome/browser/value_store/leveldb_value_store_unittest.cc b/chrome/browser/value_store/leveldb_value_store_unittest.cc
index 67fc3821cffcc69676497c7f360672d6241fde6a..f6fa99f5427bb39f848b99641943f6e3669f323a 100644
--- a/chrome/browser/value_store/leveldb_value_store_unittest.cc
+++ b/chrome/browser/value_store/leveldb_value_store_unittest.cc
@@ -166,7 +166,7 @@ TEST_F(LeveldbValueStoreUnitTest, RestoreFullDatabase) {
   for (base::FilePath file = enumerator.Next(); !file.empty();
        file = enumerator.Next()) {
     // WriteFile() failure is a result of -1.
-    ASSERT_NE(file_util::WriteFile(file, kLolCats.c_str(), kLolCats.length()),
+    ASSERT_NE(base::WriteFile(file, kLolCats.c_str(), kLolCats.length()),
               -1);
   }
   OpenStore();